Designation:D478−02(Reapproved2012)StandardSpecificationforZincYellow(ZincChromate)Pigments1ThisstandardisissuedunderthefixeddesignationD478;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thisspecificationcoversthepigmentscommerciallyknownaszincyellow(zincchromate).1.2Twotypesareincluded:1.2.1TypeI—High-purity,lowsulfateandchloridecontent.1.2.2TypeII—Regulargrade.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.2.ReferencedDocuments2.1ASTMStandards:2D185TestMethodsforCoarseParticlesinPigmentsD387TestMethodforColorandStrengthofChromaticPigmentswithaMechanicalMullerD444TestMethodsforChemicalAnalysisofZincYellowPigment(ZincChromateYellow)3.SignificanceandUse3.1Zincyellowisusedinrust-inhibitingprotectivecoatingsandmetalprimersforferrousandnon-ferrousmetals.4.CompositionandProperties4.1DryPigment—Thepigmentshallbeareactionprecipi-tateofsolublechromatesandasuitablezinccompoundandshallbefreeofextenders,carbonates,andorganiccolorinanyform.ThepigmentshallconformtotherequirementsforcompositionprescribedinTable1.4.2Themasscolorandcharacterofthetintandthetintingstrengthformedbyamixturewithawhitepigmentshallbewithinmutuallyagreeduponlimitsofastandardacceptabletoboththepurchaserandtheseller.5.Sampling5.1Twosamplesshallbetakenatrandomfromdifferentpackagesfromeachlot,batch,day’spack,orotherunitofproductioninashipment.Whennomarkingsdistinguishingbetweenunitsofproductionappear,samplesshallbetakenfromdifferentpackagesintheratiooftwosamplesforeach4545kg(10000lb),exceptthatforshipmentsoflessthan10000lbtwosamplesshallbetaken.Attheoptionofthepurchaser,thesamplesmaybetestedseparatelyorafterblendinginequalquantitiesthesamplesfromthesameproductionun...
